Lock for dumb-waiters.



M. STRELCSIK.

LOCK FOR DUMB WAITERS.

APPLICATION FILED SEPT. 28. I915.

Patented Apr. 25

ATTORNEY w w w W THE COLUMBIA PLANOGRAPH :0. WASHINGTON, D. c.

"uni ra LOOK FOR DUMB-WAITERS.

Specification of Letters Patent.

Patented Apr. 25, 1916.

Application filed September 28, 1915. Serial No. 53,032.

To all whom it may concern Be it known that 1, MICHAEL STRELOSIK, a subject of the King of Hungary, residing at 1472 iVilkins avenue, in the city of New York, in the county of Bronx and State of New York, have invented new and useful Improvements in Looks for Dumb-Waiters, of which the following is a specification.

This invention relates to improvements in means for securing the doors leading to dumb waiter shafts in apartment houses and has for its principal object the provision of means whereby such doors are under control of the janitor or attendant and operable from a single convenient point. In such houses, it is too frequently the custom of the inmates to use the dumb waiter at irregular and undesirable hours, to the annoyance of others and inconvenience of the janitor, and it is to avoid such occurrences by providing means whereby the shaft is rendered inaccessible, except at proper times, that this device is intended.

This object is attained by the novel construction and combination of parts here after described and shown in the accompanying drawing, forming part of this specification, and in which Figure 1 is a partial sectional view and side elevation of a dumb-waiter shaft, indicating the application of the invention. Fig. 2 is an enlarged, transverse section of the same, taken on line 22 of Fig. 1. Fig. 3 is an enlarged side view with the parts shown in Fig. 2. Fig. 4- is a front view, showing in detail the operating means, and Fig. 5 is a vertical, sectional view of the same.

To each of the doors 10 is attached a keeper 11, having an open loop 12, extending inwardly toward the shaft and in register with it is a plate 14 attached to the interior side wall of the shaft, so close as not to interfere with the passage of the car.

A pair of looops 15, rigid with the plate 14, act as guides for the slide 16, having at its far end an angular extension 17 at the front end along the edge are formed rack teeth 18 and engageable therewith is a corresponding segment 19 of the latch 20 having a hook shaped catch 21 engageable with the loop 12; a spiral pull spring 22 attached at one end to the slide and at the other to one of the loops 15, serves to retract the slide when free. Secured to the rear wall is another plate 25, having on its face a flat strap-like spring 26, fastened at its lower end, having at the upper end a post 27, extending rearwardly through a slot 28 formed in the plate 25 and has attached to its end the cable 30 guided by the loop 29, set in the back of the plate. All these cables are conducted down to the bottom of the shaft where, at some convenient point, they terminate in rings 31, or analogous operating means, each being numbered or otherwise distinguished for operation.

hen it is desired to unlock any door, the corresponding cable is pulled, causing the post 27 to move down in its guiding slot and by reason of its engagement with the strap spring 26, cause it to spring outward, in the manner of a bow, make contact with the extension 17 and through it press the slide 16 forward, actuating the hook or catch 21, thus freeing the door. released,-the spring 26 straightens out so that upon closing the door, the catch again engages, it being held normally in operative position by the spring 22. Thus it is readily possible to release any selected door or doors, at such time as may be desirable and prevent these doors from being opened at other times unauthorizedly.

' Manifestly modifications may be made from the exact structure shown, as for in-.

stance, forming a rack upon both edges of the slide, and using a double engaging hook, etc., without departing from the spirit of the invention indicated by the annexed claims.

Having thus described the invention and ascertained its construction, purpose and use, what I claim as new and desire to secure by Letters Patent is 1. In a device of the class described, the combination with a door having a keeper aflixed thereto, a rigid plate adjacent to said door a slide movable on said plate having teeth formed thereon, a hooked latch pivoted on said plate, said latch having a part operatively engaged with the mentioned teeth, a resilient strap in register with said slide, said strap having one free end, and means for bowing said strap, whereby operative contact is made with said slide.

2. In a device of the class described, the combination with a swinging door having a When the cable is keeper affixed at its inner side, a pivotally mounted hooked catch engageable With said keeper, a slide adapted to actuate said catch, means for maintaining said catch in engagement With said keeper a spring element secured at one end in register With said slide a post set in the free end of said spring element, and means combined with said post, whereby said spring element is caused to move outwardly, thereby actuating the said 10 slide.

In testimony whereof I have signed my name to this specification.

MICHAEL STRELCSIK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents. Washington, D. 0. 

